The answer is below.
Work Step by Step
In order to see if a radical is in simplified form, see if any of its factors are perfect squares (meaning that their square root will be an integer). Consider $ \sqrt 12$. It has factors of 3 and 4. 3 is not a perfect square, but 4 is. Thus, we know we can simplify $ \sqrt 12$ to $ 2\sqrt 3$.